mac_lso_get

Synopsis

Description

LSO (Large Segment Offload, or Large Send Offload) allows the network stack
to send larger buffers to a device driver. These large buffers can
then segmented in hardware, allowing for reduced CPU utilization, PCI overhead, and
reduced buffer management costs.

LSO is enabled only for device driver instances that advertise support for
the MAC_CAPAB_LSO capability through the mc_getcapab(9E) entry point.

Once a device driver advertises the LSO capability, it must use the
mac_lso_get() entry point to query whether LSO must be performed on the
packet. The following values for the flags argument are supported:

HW_LSO

When set, this flag indicates that LSO is enabled for that packet. The maximum segment size (MSS) to be used during segmentation of the large segment is returned through the location pointed to by mss.